/*

 * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/* @test

 * @bug 4512723 6621689

 * @summary Test that connect/send/receive with unbound DatagramChannel causes

 *     the channel's socket to be bound to a local address

 */

import java.net.*;

import java.nio.ByteBuffer;

import java.nio.channels.DatagramChannel;

import java.io.IOException;

public class NotBound {

    static void checkBound(DatagramChannel dc) throws IOException {

        if (dc.getLocalAddress() == null)

            throw new RuntimeException("Not bound??");

    }

    // starts a thread to send a datagram to the given channel once the channel

    // is bound to a local address

    static void wakeupWhenBound(final DatagramChannel dc) {

        Runnable wakeupTask = new Runnable() {

            public void run() {

                try {

                    // poll for local address

                    InetSocketAddress local;

                    do {

                        Thread.sleep(50);

                        local = (InetSocketAddress)dc.getLocalAddress();

                    } while (local == null);

                    // send message to channel to wakeup receiver

                    DatagramChannel sender = DatagramChannel.open();

                    try {

                        ByteBuffer bb = ByteBuffer.wrap("hello".getBytes());

                        InetAddress lh = InetAddress.getLocalHost();

                        SocketAddress target =

                            new InetSocketAddress(lh, local.getPort());

                        sender.send(bb, target);

                    } finally {

                        sender.close();

                    }

                } catch (Exception x) {

                    x.printStackTrace();

                }

            }};

        new Thread(wakeupTask).start();

    }

    public static void main(String[] args) throws IOException {

        DatagramChannel dc;

        // connect

        dc = DatagramChannel.open();

        try {

            DatagramChannel peer = DatagramChannel.open()

                .bind(new InetSocketAddress(0));

            int peerPort = ((InetSocketAddress)(peer.getLocalAddress())).getPort();

            try {

                dc.connect(new InetSocketAddress(InetAddress.getLocalHost(), peerPort));

                checkBound(dc);

            } finally {

                peer.close();

            }

        } finally {

            dc.close();

        }

        // send

        dc = DatagramChannel.open();

        try {

            ByteBuffer bb = ByteBuffer.wrap("ignore this".getBytes());

            SocketAddress target =

                new InetSocketAddress(InetAddress.getLocalHost(), 5000);

            dc.send(bb, target);

            checkBound(dc);

        } finally {

            dc.close();

        }

        // receive (blocking)

        dc = DatagramChannel.open();

        try {

            ByteBuffer bb = ByteBuffer.allocateDirect(128);

            wakeupWhenBound(dc);

            SocketAddress sender = dc.receive(bb);

            if (sender == null)

                throw new RuntimeException("Sender should not be null");

            checkBound(dc);

        } finally {

            dc.close();

        }

        // receive (non-blocking)

        dc = DatagramChannel.open();

        try {

            dc.configureBlocking(false);

            ByteBuffer bb = ByteBuffer.allocateDirect(128);

            SocketAddress sender = dc.receive(bb);

            if (sender != null)

                throw new RuntimeException("Sender should be null");

            checkBound(dc);

        } finally {

            dc.close();

        }

    }

}